O,o-dihydrocarbyl-n-alkylthio- or narylthio phosphoroamidothioate

ABSTRACT

COMPOUNDS OF THE FORMULA   R-O-P(=O)(-S-R1)-N(-R2)-S-R3   WHEREIN R AND R1 ARE INDEPENDENTLY ALKYL, ALKENYL OR ALKYNYL; R2 IS HYDROGEN, ALKYL OR -SR3; AND R3 IS ALKYL OPTIONALLY SUBSTITUTED WITH HALOGEN ATOMS OR ARYL OPTIONALLY SUBSTITUTED WITH ALKYL GROUPS OR HALOGEN ATOMS. THE COMPOUNDS ARE INSECTICIDES.

United States Patent Olfice 3,755,507 Patented Aug. 28, 1973 3,755,507 0,0-DIHYDROCARBYL-N-ALKYLTHIO- R N- ARYLTHIO PHOSPHOROAMIDOTHIOA'IE Melancthon S. Brown, deceased, by Gustave K. Kohn,

administrator, Berkeley, Calif., assignor to Chevron Research Company, San Francisco, Calif. No Drawing. Filed June 21, 1971, Ser. No. 155,292

Int. Cl. A01n 9/36; C07f 9/22, 9/24 US. Cl. 260-947 14 Claims ABSTRACT OF THE DISCLOSURE Compounds of the formula wherein R and -R are independently alkyl, alkenyl or alkynyl; R is hydrogen, alkyl or SR and R is alkyl optionally substituted with halogen atoms or aryl optionally substituted with al-kyl groups or halogen atoms. The compounds are insecticides.

BACKGROUND OF THE INVENTION Field The present invention is directed to O-hydrocarbyl-S- hydrocarbyl-N-alkylthioor N-arylthio phosphoroamidothioates and their use in the control of insects. More particularly the present invention is concerned with O-alkyl- S-alkyl-N-haloalkylthioor N-arylthio phosphoroamidothioates.

Prior art U.S. Pat. 3,309,266 discloses certain O-alkylS-a1kyl phosphoroamidothioates and their use as insecticides. See also Netherlands Pat. '691'1926 directed to certain O alkyl-S-alkyl phosphoroamidothionates. Also U.S. 3,511,- 632 discloses certain N-substituted phosphoroamidothioates which are useful as herbicides.

DESCRIPTION OF THE INVENTION The compounds of the present invention can be represented by the following formula wherein R and R are individually alkyl, alkenyl or alkynyl of 1 to 3 carbon atoms; R is hydrogen, alkyl of 1 to 3 carbon atoms or SR and R is alkyl of 1 to 4 carbon atoms substituted with 0 to 4 halogen atoms of atomic number 9 to 35 (fluorine, chlorine or bromine), or aryl of 6 to- 12 carbon atoms substituted with 0 to 4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35. Generally, the total number of substituents on the aryl group will not exceed 4. The R and R groups may be the same or different. Of course, when R and R are alkenyl or alkynyl, the minimum number of carbon atoms is 2.

Preferably, R and R are alkyl of 1 to 3 carbon atoms, more preferably alkyl of 1 to 2 carbon atoms. Preferably R and R will be the same.

Preferably, R is hydrogen or SR wherein R is aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

Preferably, R is alkyl of 1 to 2 carbon atoms, alkyl of l to 2 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 2 alkyl groups of 1 t0 4 carbon atoms or halogen atoms of atomic number 9 to 35. The most preferred R groups will be halogenated alkyl groups such as halomethyl or haloethyl, particularly tetrachloroethyl or phenyl substituted with 0 to 1 alkyl group, preferably methyl or halogen atoms, preferably chlorine.

Representative radicals which R and R may represent include methyl, ethyl, n-propyl, isopropyl, vinyl, allyl or propargyl.

Representative groups which R may represent, in addition to hydrogen, include methyl, ethyl, n-propyl, isopropyl, tetrachloroethylthio, perchloromethylthio, dichloromethylthio, 1,2,2-trichloroethylthio, phenylthio, mchlorophenylthio, p-chlorophenylthio, p-methylphenylthio, etc.

Representative groups which R may represent include methyl, ethyl, n-propyl, isopropyl, butyl, l-chloroethyl, 2,2-dichloroethyl, 1,2,2-trichloroethyl, l,2,2,3-tetrachloropropyl, 1,1,2,2 tetrachloroethyl, fluorodichloromethyl, bromodichloromethyl, 1,1-dichloro-2,2-dibromoethyl, 1,1- dichloro-2,2-difiuoroethyl, phenyl, naphthyl, p-butylphenyl, p-methylphenyl, o-methylphenyl, o,p-dimethylphenyl, p chlorophenyl, m bromophenyl, o fluorophenyl, 2- chloro 4 methylphenyl, 2,4,6-trichlorophenyl, o-ethylphenyl, p-propylphenyl, etc.

Representative compounds of the present invention include O,S-dimethyl-N-methylthiophosphoroamidothioate, O,S-dimethyl-N-ethylthiophosphoroamidothioate, O,S-dimethyl-N-propylthiophcsphoroamidothioate, O,S-dimethyl-N-trichloromethylthiophosphoroamidothioate, O,S-dimethyl-N-l,2,2,2-tetrachloroethylthiophosphoroamidothioate, O,S-dimethyl-N- 1, 1,2, 2-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-ethyl-N- 1 1,2,2-tetrachloro ethylthiophosphoroamidothioate, O-ethyl-S-methyl-N- l 1,2, 2-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-allyl-N- 1 1,2,2-tetrach1oroethylthiophosphoroamidothioate, O-methyl-S-propargyl-N-1,2,2,2-tetrachloroethylthiophosphoroamidothioate, O,S-dime thyl-N- 1, 1 ,2,2-tetrachloropropylthiophosphoroamidothioate, O-methyl-S-propyl-N-1,2,2-trichloroethylthiophosphoroamidothioate, O-methyl-S-ethyl-N-phenylthiophosphoroamidothioate, O,S-dimethyl-N-4-chlorophenylthiophosphoroamidothioate, O,S-dimethyl-N-3,4-dichlorophenylthiophosphoroamidothioate, O,S-dimethyl-N-Z,4-dichlorophenylthiophosphoroamidothioate, O,S-dimethyl-N-2-fluorophenylthiophosphoroamidothioate, O,S-dimethyl-N-3-methylphenylthiophosphoroamidothioate, O,S-diallyl-N-trichloromethylthiophosphoroamidothioate, O,S-diethyl-N-1, 1,2, 2-tetrachloroethylthiophosphoroamidothioate, O,Zdipropargyl-N-4-chlorophenylthiophosphoroamidoioate, O-ethyl-S-methyl-N-2-chloro-4-bromophenylthiophosphoroamidothioate, 0,0-dimethyl-N-2,4,6-tribromophenylthiophosphoroamidothioate, O,S-dimethyl-N-3 -fluoro-4-methylphenylthiophosphoroamidothioate, O-methyl-S-ethyl-N-1-bromo-2,2,2,-trichloroethylthiophosphoroamidothioate,

3 O-ethylS-methyl-N- 1 1-dichloro-Z,2-dibromoethylthiophosphoroamidothioate, Q-allyl-S-methyl-N-4-chlorophenylthiophosphoroamidothioate, O,S-dipropargyl-N-I,1,2,2-tetrachloroethylthiophosphoroamidothioate, 0,8-diallyl-N-phenylthiophosphoroamidothioate, O,S-diethyl-N-phenylthiophosphoroamidothioate, O,S-diallyl-N-2-chlorophenylthiophosphoroamidothioate, O,S-diallyl-N-4-butylphenylthiophosphoroamidothioate, 0,S-dimethyl-N-2,4-diethylphenylthiophosphoroamidothioate, O,S-diethyl-N-2,3-dimethylphenylthiophosphoroamidothioate, O-allyl-S-propargyl-N-Z-methyl-4-bromophenylthiophosphoroamidothioate, O-methyl-S-propargyl-N-Z-fluoro-4-methylphenylthiophosphoroamidothioate, O,S-diisopropyl-N-trichloroethylthiophosphoroamidothioate, 0,Sdimethyl-N,N-di-trichloromethylthiophosphoroamidothioate, 0,8-dimethyl-N,N-di-trichlorophenylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-1,l,2,Z-tetrachloroethylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-4-chlorophenylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-2,4-dichlorophenylthiophosphoroarnidothioate, -allyl-S-methyl-N,N-di-4-bromophenylthiophosphoroamidothioate, O-propargyl-S-methyl-N,N-di-2,4-difluorophenylthiophosphoroamidothioate, O-ethyl-S-methyl-N,N-di-3,4-di-chlorophenylthiophosphosphoroamidothioate, O,S-dimethyl-N-trichloromethylthio-N-4-chlorophenylthiophosphoroamidothioate, O,S-dimethyl-N-ethylthio-N-phenylthiophosphoroamidothioate, O,S-dimethyl-N-methyl-N-1, 1,2, Z-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-allyl-N-trichloromethylthio-N-4-chloromethylthiophosphoroamidothioate, O-methyl-S-propyl-N-1-brom0-2,2,2-trichloroethylthio- N-l l,2,Z-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-allyl-N-1-bromo-2,2,Z-trichloroethylthio-N-2- fluorophenylthiophosphoroamidothioate, O,S-diallyl-N,N-diphenylthiophosphoroamidothioate, 0,S-dimethyl-N,N-di-4-methylphenylthiophosphoroamidothioate, etc.

The compounds of the present invention in which R is hydrogen or an alkyl of 1 to 3 carbon atoms are prepared by the reaction of an appropriate O-hydrocarbyl-S-hydrocarbyl phosphoroamidothioate with a sulfenyl chloride according to the following reaction:

wherein R, R and R are as described above and R is hydrogen or alkyl of 1 to 3 carbon atoms. In this process, a molar amount, or slight excess of the sulfenyl chloride compound is reacted with a molar amount of the phosphoroamidothioate. The reaction is carried out in a solvent, such' as dimethyl formamide or dioxane. The quantity of solvent in weight varies from 2 to times the combined weight of the reactants. At least a molar equivalent of a base is included to remove the HCl as formed. Suitable bases include triethylamine, pyridine, quinuclidine and N-methylmorpholine.

The reactants in reaction (I) above are mixed at temperatures in the range of 0 to 150 C. The reaction is exothermic and after mixing it is desirable to maintain the temperature within the range of 0 to 35 0., preferably 0 to 25 C., by external cooling, by mixing slowly, or both. Generally the reaction time is from 10 to 120 minutes after the reactants have been combined.

T 0 prepare compounds of the present invention wherein R is SR the mono-substituted amide is prepared according to reaction (I) above wherein R is hydrogen, and then the reaction product is reacted with a second mole of an appropriate sulfenyl chloride to give the desired diamide according to the following equation:

R0 (1) RO\$I) S R P-NH-S R R 8 Cl -v /PN H01 R S R 8 S R (II) wherein R, R and R are as defined previously; and two R s may be the same or diiferent. The reaction conditions for reaction (II) are the same as for the first step described above, reaction (I). Of course, when preparing the diamide having two SR groups attached to the nitrogen and where the R s are the same, the appropriate O-hydrocarbyl-S-hydrocarbyl phosphoroamidothioate can be reacted with 2 moles of an appropriate sul fenyl chloride in the presence of two or more equivalents of base.

In all of the above reactions the product can be recovered by diluting the reaction mixture with a large excess of ice water and then extracting with a water insoluble organic solvent such as diethyl ether or chloroform. The extract is then dried and evaporated to give the crude product. This crude product can be used as such or can be further purified by chromatography or crystallization. The preferred solvents for crystallization are mixtures of benzene and hexane.

The present invention can be more fully understood by reference to the following examples.

EXAMPLE 1 Preparation of (LS-dimethyl-N-4-chlorophenylthiophosphoroamidothioate To an ice-cold solution of 10 g. (0.071 mole) of 0,8- dimethyl phosphoroamidothioate dissolved in 50 m1. of dimethylformamide containing 6 g. (0.076 mole) of pyridine there was slowly added 13 g. (0.073 mole) of 4chlorophenylsulfenyl chloride. The resulting mixture was stirred for 1 /2 hours as the temperature was slowly increased from 0 to 25 C. At the end of this time, the reaction mixture was combined with 250 ml. of ether and then washed with 250 ml. of water, 250 m1. of dilute salt water, and with ml. of saturated salt water. The ether solution was dried and then evaporated under vacuum. As the ether was being removed, the crude product precipitated, and was removed by filtration. The product, after crystallization from a benzene/hexane mixture, weighed 6 g. and had a melting point of 99-102" C. Analysis was as follows: Calcd. (percent): S, 22.6; CI, 12.5; P, 10.9. Found (percent): S, 21.8; Cl, 13.3; P, 11.2.

The infrared spectra had strong adsorption bands at 6.8, 7.2, 8.2, 9.65, 10.55 and 12.15 microns.

EXAMPLE 2 Preparation of O,S-dimethyl-N,N-di-4-chlorophenylthiopho sphoroamidothioate 10 g. (0.035 mole) of 0,8-dimethyl-N-4-chlorophenylthiophosphoroamidothioate, prepared as in Example *1, was dissolved in 50 ml. of diethyl formamide containing 2 g. (0.018 mole) of 1,4-diazabicyclo[2,2,2]octane. This solution was cooled in an ice-bath and then 7 g. (0.039 mole) of 4-chlorophenylsulfenyl chloride was added slowly. When all had been added, the ice-bath was removed and the mixture was stirred at ambient temperature for 1 hour. At the end of this time 500 ml. of ice water was added. The resulting mixture was extracted with three 250 ml. portions of diethyl ether. The ether extracts were combined, washed with salt water and then dried. The ether will be effective in concentrations from about 0.0001 persolvent was removed by evaporation under vacuum to cent by weight to as high as 50 percent by weight or give the crude product. The crude product was dissolved g mi ally, of course, it s desirable t us in a mixture of 10 1 of benzene and 50 1 of hexane lower concentrations of this active ingredient. Thus, it is The resulting solution was added to a silica gel packed 5 usually desl rable less thafl 20 P lf Weight of chromatography Column and eluted with a 1:4 Solution the active ingredient in a particular composition. of chloroforrmdiethyl ether. The product was an oily The were w1th P f liquid Analysis was as follows: Calcd (percent): S, 22.6; of the present invention to show their insectlcidal activ- CI, 166 Found (percent): S 221; CI 182' my. The test results are reported in Table II.

The infrared spectra had strong adsorption bands at: Test procedures and f Houseflies (Musca domestica L): A 500 p.p.m. acetone other Compounds of the Present Invention were solution of the candidate toxicant was placed in a micropared by the procedures described above and are tabulated sprayer t i A random mixture f anesthetized in Table I. male and female flies was placed in a container and 55 TABLE I Elemental analysis, percent 5 N P 01 Compound Cale. Found Cale. Found Cale. Found Cale. Found 6." O,S-dimethyl-N-4-methylphenylthiophosphoroamidoi'hinma 24. 4 23. 3 5. 3 4. 9 94-97 0,S-dimethyl-N-phenylthiophosphoroarnidothioate 25.7 25.4 12,4 12 3 69-72 0,S-dimethyl-N-l,1,2,2-tetraehloroethylthiophosphoroa idothirmtp a 18.9 18.7 42.8 41.7 140-142 0,s-diathy1-N-4-chlorophenylthiophosphoroamidothioate 20.5 20.4 11.4 11.5 Oil 0,S-dirnethyl-N,N-diA-methylphenylthiophosphoroaruidothinata 25.0 24.4 8.1 7.5 58-61 The compounds of th'e present invention find use as .mg. of the above-described acetone solution was sprayed insecticides. The term insecticide and insect as used on them. A lid was placed on the container. A mortality herein refer to their broad and commonly understood reading was made after 24 hours. usage rather than to those creatures which in the strict Aphids (Aphis gossypii Glover): An acetone solution biological sense are classified as insects. Thus, the term of the candidate toxicant containing a small amount of insect is used not only to include small invertebrate nonionic emulsifier was diluted with water to 30 p.p.m. animals belonging to the class Insecta but also to other Cucumber leaves infested with the cotton aphids were related classes of arthropods whose members are segmentdipped in the toxicant solution. Mortality readings were ed invertebrates having more or fewer than six legs, such as then taken after 24 hours. spider, mites, ticks, centipedes, worms and the like. 40 Two-spotted mites (Tetramuchus urticae): An ace- The compounds of the present invention may be applied tone solution of the candidate toxicant containing a small in either liquid or solid formulations to the insects, their amount of nonionic emulsifier was diluted with water to environment or hosts susceptible to insect attack. For 100 p.p.m. Pinto bean leaves which were infested with example, they may be sprayed or otherwise applied directly mites were dipped in the toxicant solution. Mortality readto plants or soil so as to effect control of insects coming ings were taken after 24 hours. into contact therewith. Cabbage looper (Trichopulsia ni): An acetone solution Formulations of the compounds of this invention will of the candidate toxicant containing a small amount of comprise a toxic amount of one or more of the compounds nonionic emulsifier was diluted with water to 500 p.p.m. and a biologically inert carrier. Usually they will also Cucumber leaf sections were dipped in the toxicant socontain a wetting agent. Solid carriers such as clay, talc, lution and dried. The sections were then infested with cabsawdust and the like may be used in such formulations. bage looper larvae. Mortality readings were taken after Liquid diluents which may be used with these compounds 24 hours. include water and aromatic solvents. In addition these Two-spotted mites (Tetramuchus urticae): Systemic formulations may contain other compatible pesticides, evaluation: An acetone solution of the candidate toxicant fillers, stabilizers, attractants and the like. containing a nonionic emulsifier was diluted with water The concentration of the active ingredient to be used to give 500 p.p.m. solution. The solution was poured with inert carriers, either solid or liquid carriers, will be around pinto bean plants at a rate of 225 micrograms dependent upon many factors, such as the particular comper cm? surface area of the soil around the plants. Two pound which is used, the carrier in or upon which it is inreplicates were used. The plants were not watered for 24 corporated, the method and conditions of application, the hours and then were watered daily. 48 hours after treatinsect species to be controlled, etc., the proper considerament with the candidate toxicant the plants were infested tion of these factors being within the skill of those versed with mites. The percent control based on the mortality in the art. In general, the toxic ingredients of this invention of the mites was determined.

TABLE 11 Percent mortality Systemic Cabbage evaluation Compound Houseflies Aphids Mites looper mites 0,S-dimethyl-N-4-chlorophenylthiophosphoroamidoth 100 60 100 O,S-dirnethyl-N,N-di-4-chlorophenylthiophosphoroamidothioate 100 78 100 O,S-dimethyl-N- l-methylphenylthiophosphoroamido 100 99 100 0,S-dimethyl-N-phenylthiophosphoroamidothioate 100 100 100 100 100 0,S-dimethyl-N-l,l,2,2-tetraehloroethylthiophos horoamitlothioate- 100 98 99 100 100 0,S-diethyl-N-kchlorophenylthiophosphoroarni othioate 90 100 78 100 0,S-dimethyl-N,N-di-a-methylphenylthiophosphoroamidothioate- 100 100 100 78 100 As will be evident to those skilled in the art, various modifications on this invention can be made or followed, in the light of the foregoing disclosure and discussion, without departing from the spirit or scope of the disclosure or from the scope of the following claims.

What is claimed is:

1. Compound of the formula wherein R and R are individually alkyl, alkenyl or alkynyl of up to 3 carbon atoms; R is hydrogen, alkyl of l to 3 carbon atoms or SR and R is alkyl of 1 to 4 carbon atoms substituted with to 4 halogen atoms of atomic number 9m 35 or" aryl of 6 to 12 carbon atoms substituted with 0 m4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

2. Compound of claim 1 wherein R and R are alkyl of 1 to 3 carbon atoms.

3. Compound of claim 1 wherein R is hydrogen or SR and wherein R is aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

4. Compound of claim 1 wherein R is alkyl of 1 to 2 carbon atoms, alkyl of 1 to 2 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 2 alkyl groups of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

5. Compound of claim 1 wherein R is alkyl of 1 to 2 carbon atoms substituted with l to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with O to 1 alkyl group of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

6. Compound of claim 1 wherein R and R are individually alkyl of 1 to 2 carbon atoms; R is hydrogen and R is tetrachloroethyl or phenyl substituted with O to 1 methyl group or chlorine atom.

7. Compound of claim 1 wherein R and R are the same and are methyl or ethyl; R is hydrogen or SR and R is tetrachloroethyl or phenyl substituted with 0 to 1 alkyl group of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

8. The compound of claim 7 being O,S-dimethyl-N-4- chlorophenylthiophosphoroamidothioate.

9. The compounds of claim 7 being O,S-dimethyl-N,N- di-4-ch1orophenylthiophosphoroamidothioate.

10. The compound of claim 7 being O,S-dimethyl-N- 4-rnethylphenylthiophosphoroamidothioate.

11. The compound of claim 7 being O,Sdimethyl-N- phenylthiophosphoroamidothioate.

12. The compound of claim 7 being O,Sdimethyl-N- l 1 ,2,2-tetrachloroethylthiopho sphoroamidothio ate.

13. The compound of claim 7 being O,S-diethyl-N-4- chlorophenylthiophosphoroamidothioate.

14. The compound of claim 7 being O,S-dirnethyl-N,N- di-4-methylphenylthiophosphoroamidothioate.

References Cited UNITED STATES PATENTS 2,957,020 10/1960 Perkow 260-959 X 2,971,020 2/1961 Schrader 260959 X 3,309,266 3/1967 Magee 424-220 LEWIS GOTTS, Primary Examiner R. L. RAYMOND, Assistant Examiner U.S. Cl. X.R. 

